Bought 2005 Infiniti Q45 from estate of original owner. Two key fobs. One working ignition etc. and one only works doors. Had batteries in both replaced at local "Batteries and Bulbs" store. Second fob still not working in ignition. "Security" light flashes on dash. They tried to re-program. Unable to as they related msg read "DO", dealer only. Took to Infiniti dealer and they were also unable to re-program. Prior to paying $631. for new key and add. $75. at dealer to re-program, anyone have any ideas? Thanks